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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 1 |
| 10 | 10 |
| 11 | 15 |
| 12 | 85 |
| 13 | 140 |
| 14 | 618 |
| 15 | 1050 |
| 16 | 4065 |
| 17 | 6951 |
| 18 | 24915 |
| 19 | 42525 |
| 20 | 145067 |
| 21 | 246730 |
| 22 | 814215 |
| 23 | 1379400 |
| 24 | 4446631 |
| 25 | 7508501 |
| 26 | 23798600 |
| 27 | 40075035 |
| 28 | 125436313 |
| 29 | 210766920 |
| 30 | 653517228 |
| 31 | 1096190550 |
| 32 | 3374555449 |
| 33 | 5652751651 |
| 34 | 17305633285 |
| 35 | 28958095545 |
| 36 | 88274142232 |
[0,0,0,0,0,0,0,1,1,10,15,85,140,618,1050,4065, 6951,24915,42525,145067,246730,814215,1379400, 4446631,7508501,23798600,40075035,125436313, 210766920,653517228,1096190550,3374555449, 5652751651,17305633285,28958095545,88274142232] |